Hypodermic needle



March 5, 1935.V J. K. clsLAK HYPODERMIC NEEDLE Filed Jan. 23, 1955 Patented Mar. 5, 1935 on-"ice HYPODERMIC NEEDLEL AJosephfKr. Cislak,

application January 23, 19,33, "N t. 653-,049f' 3 claims. (c1. lgs-221)) The'present invention isjdirected generally to a. hypodermic syringe, but more particularly to the construction of the needle itself and the means of detachably fastening the needle to the Alower end of the hypodermic nipple so as to make the same easy .to replace without removing the lower part "attached to the hypodermic nipple.` v Heretoforeit `has been the practice to form a fiangev on the upper end ofthe needle proper which is sometimes'in a partial spherical form so as to be seated'into a spherical cavity `of the nipple :connection or needle supporting member, and when it becomes "necessary, to..replace the needleiin this type of hypodermic syringe it .has

l5A been the practice heretofore to entirely remove the nippley connectionfrom `the nipple proper and re.- movetheneedlelongitudinally through the top of the. opening through which the nipple isvconnected. .This practice: ha'srbeen found very unsatisfactory for the reason that in mostcases'the nipple is usually made of glass and frictionally secured to the yconnection which supports the needle. In removing this connection it is extremely diflicult and entails considerable vtime to rethe primary objects of my invention to provide a simple needle construction and support for the needle which can be easily and quickly removed or replaced with the least amount of effort.

These and other objects are accomplished by providing a construction and arrangement of the various parts in the manner hereinafter described and particularly pointed out in the appended claims.

Referring to the drawing Fig. 1 is a side elevational view of the conventional form of hypodermic syringe having my improved needle attachment embodied therein.

Fig. 2 is an enlarged fragmentary cross sec- 40 tional View showing in detail the manner in which the needle proper is detachably secured so as to form liquid tight fit into the needle connection.

Fig. 3 is an enlarged cross sectional view taken on the lines 3-3 in Fig. 2. y

Fig. 4 is an enlarged fragmentary view showing the manner in which the needle connection grips the upper portion of the needle to form a liquid tight t, and

Fig. 5 is a similar enlarged fragmentary cross 50 sectional view showing the connecting members partially separated preparatory. to tightening their grip on the upper portion of the needle.

It has been the practice heretofore in connection with hypodermic syringes in order to remove 55 a broken needle to rst remove the needle conplace a broken needle, and it is therefore one of nection from the barrel or nipple and longitudinally :move the 4:needle out through the top opening previouslyoccupied'bythe barrel or nipp ple1of the hypodermic syringe. With this type of construction the upper portion of the -needle was provided withL an annular flange, somewhat of a semi-sphericalconstruction, which seated itself in the connection orfneedle'support after which itwas replaced on the barrel or nipple of thesyringe. This arrangement entailed considerableA inconvenience especially in removing the nipple-lfrom-the needle support or connection; The presentinventioneliminates the necessity of removing this connection and permits the removal or insertion of the needle proper into the connection after the lower threaded barrel is loosened from the upper threaded connection. l.

In illustrating one form of my invention 1 have shown the same in connection vwith the `conven tional formfof hypodermic syringe nipple or bar-v rel indicated byithereference character 10, which iszupreferably,l though4 not necessarily,` made of glass, and is provided with a reduced cylindrical portion, as shown at 1l. Reciprocally mounted in the barrel or nipple is a suitable plunger 12 of any well known construction. Frictionally secured to the reduced portion 11 of the nipple or barrel is a connecting member 13, which in turn is provided with a cylindrical recess 14 into which the reduced portion 11 of the nipple 10 is inserted. Formed as a continuation of the cylindrical recess 14 and extending partway therethrough is a longitudinal bore 15 which is enlarged slightly, as shown at 16, so as to form a shoulder 17 against which the upper end of the hypodermic needle 18 is adapted to be seated. The lower end ofthe connecting member 13'is considerably reduced and beveled, as shown atY 19, and terminates in a curved and pointed end, as shown at 20. An intermediate portion of the connecting member 13 is provided with external threads, as shown at 21, and is adapted toreceive in threaded engagement therewith a threaded sleeve or cap 22, which in turn is vsimilarly provided with a knurled portion, generally indicated by the reference character 23. This sleeve is provided with an internal threaded portion 24 and is adapted to be mounted in threaded engagement with the external threaded portion 21 of the connecting member 13. Located in the longitudinal center of the cap 22 is a bore 25 through which the needle 18 may be inserted. The member 22 is also provided with a conically shaped or beveled recess 26 which terminates adjacent the bore 25 with a curved portion 27, which is adapted to engage the curved portion of the connecting member 13 for impinging or pressing inwardly the contiguous portion of the needle as is exaggerated at 27 in Fig. 4 of the drawing.

Obviously, when the internal threaded member or cap 22 is slightly unscrewed from its complementary external threaded connecting member 13 the needle 18 may be removed longitudinally from its socket 16 and seat 1'1 in the member 13 and a new needlereplaced and'securedftherein so as to form a liquid tight connection by merely inserting the needle in the socket and securely screwing up or tightening the member 22 on the connecting member 13. i

From the above description it willV be readily seen that I have provided a very simple, efcient construction for quickly detaching and attaching kor replacing a broken needleand one which will readily secure the needle in position so as to form a liquid tight connection between the needle proper and the needle supporting member; In the drawing I have illustrated a relatively large hypodermic syringevconstruction but it will readily be understoodthat various sizes of needles as well as connections embodying the same construction and principle of operation may be made without departing from theinvention.

While in the above specification I have described one embodiment which my invention may needle, and a second member secured to said rst named member having a longitudinally extending aperture through which said needle freely extends, there being a beveled recess in said second named member surrounding said aperture for engaging said tapered portion and compressing said taperedportion against said needle for detachably impinging said needle on its seat in said rst named member.V

2. In a combination with a hypodermic syringe, of a nipple therefor, an exteriorly threaded member secured to said nipple, a downwardly extending unbroken tapered extension formed integrally with said member, there being a needle socket formed in said extension, a needle mounted in said socket, and an interiorly threaded cap loosely embracing a portion of said needle and in threaded engagement with said rst named member, said second named member having a tapered recess arranged concentrically with respect to and adapted to engage said extension for compressing said extension against said needle and securing said needle imposition. i

3. In combination with a hypodermic needle, of of a nipple therefor, an externally threaded 'member secured to said nipple having a socket formed therein, a needle seated in said socket, said member having a downwardly VVVprojecting unbroken tapered portion arranged concentrically with respect to and surrounding said socket, and an internally threaded member mounted in threaded engagement with said rst named member and having said needle extending freely therethrough, said second named member having a beveled recess surrounding and adaptedV to engage said downwardlyprojecting unbroken portion-for impinging a portion of said needle below the top thereof whereby said needle 'may' be removed or replaced without removing said members from said nipple.

' JOSEPH K. CISLAK. 

